Air-heater.



F. KUHN.

AIR HEATER.

APPLIOAIION FILED mums, 191a.

9 I tnted Mar.9, 1915.

If???) asses [7? Fran 1 4 0} W THE NORRIS PETERS CO FHOTO-LITHCL,WASHINGTON. D C

FRANK KUHN, OF DETROIT, MICHIGAN.

AIR-HEATER. I

Specification of Letters Patent.

Patented Mar. 9, 1915.

Application filed June 28, 1913. Serial No. 776,254.

To all whom it may concern Be it known that I, FRANK KUHN, a citizen ofthe United States of America, residing at Detroit, in the county ofWVayne and State of Michigan, have invented certain new and usefulImprovements in Air-Heaters, of which the following is a specification,reference being had therein to the accompanying drawings.

The invention relates to air heaters, being more particularly designedfor use in connection with electrical heating units. In the constructionof such heaters it is desirable to confine the heaters within relativelysmall space dimensions; also to protect the units from injury and toprovide sufficient heating surface to quickly heat the air. Heretoforeconstructions have been made in which heating units are arranged withinan outer casing having ingress openings for the air at the bottomthereof, and a grated top which protects the units but permits theescape of the heated air. It has been found, however, that frequentlysome article, such as a cloth, is laid upon the grated surface, and byits interference with the circulation of the air, has caused the rise oftemperature to a dangerous point.

It is the primary object of the present invention to avoid this dangerby providing a construction of grated top for the heater casing, whichwill permit the free escape of the air even where the larger part of thegrated surface is covered.

To this end the invention comprises the construction as hereinafter setforth.

In the drawings: Figure 1 is a cross section through a portion of theheater casing, showing the grated top of my improved construction. Fig.2 is a perspective View of portions of the grating detached.

A is a casing preferably formed of sheet metal, within which electricheaters (not shown) are arranged.

B is a grated top for the casing A engaging the same by a bead or flangeC. The openings in this grating are sufiicient when unobstructed for theescape of heated air, but if any considerable portions of these openingswere to be closed, there would be an objectionable, if not dangerous,rise in temperature. To avoid such a result, a second grated top D isarranged above the grating B and is spaced therefrom, preferably byproviding upwardly-extending lugs or pins E on the member B, whichengage sockets F on the member D. The member D is provided withopeningsequal in area to those in the member B, and consequently the heated airwill normally pass in an upward direction through both of the gratings.The member D is, however, of greater extent than the member B, so as toprovide lateral air passages, which will remain unobstructed-even wherethe apertures in the grating are covered. Preferably the member D isprovided with flanges G, which curve downward, leaving spaces H betweentheir lower edges and the sides of the casing A sutlicient for theescape of the heated air. Thus, even where a cloth is laid over the topof the grating D and hangs down over the side of the casing, it will beheld by the flange G sufliciently spaced from the side to preventobstruction of the exit passages H for the heated air.

The parts may be mechahically secured to each other by any suitablemeans, such as bolts I passing through alined apertures J and K in thetwo gratings and extending to the base of the casing (not shown).

What I claim as my invention is: I 1. The combination with a casing forcon taining an air heater, of a grated top for said casing havingupwardly-extending lugs or pins, a super-grating supported upon saidupwardly-projecting lugs or pins and provided with sockets for engagingthe same, said super-grating having downturned marginal flanges spacedfrom the edges of said top, and tie-bolts for securing the super-gratingin place, said bolts passing through apertures in the grated top. 2. Thecombination with a casing for containing an air heater, of a grated topmember, and a super-grating member, one of said members being providedwith lugs or pins and the other member with sockets for securing saidpins, whereby the super- In testimony whereof I afiix my signaturegrating is supported at a distance above the in presence of twoWitnesses.

grated top said superratin having downr T tu rned tnztrginal flangesextending but a FRANI'L IXUHN' 5 shght chstance below and spaced fromthe Wltnessesz sides of the casing, providing exit for heat- JAMES P.BARRY,

ed air. HENRI E. BOWMAN. e

Copies of this patent may be obtained for five cents each, by addressingthe Gommissioner of Yatents,

Washington, D. G.

